00-04 V8 Tundra Cam shaft spec

[fastone01]

I need help here to anybody that might have the specs for V8 00-04 tundra intake and exhaust cam shafts. What I am looking for is the lift and duration specs.

Pictures of the cam shaft and sprocket configuration will be a plus too.

- Lift. At what degrees in relation to the crankshaft it is measured and how many milimeters the lift is measured.
- Duration. Once I get the above spec, this will give me the duration the cams are open.

Reason behind this is when I do my timing belt, I am planning to go to the whole intake and exhaust valve gap and set the correct cam timing. I know this is going to be a exhausting and long job. But it might pay off in getting more power.

Me and a nieghbor of mine has access to a mill and latte machine. He is a machinist by trade and I am planning to modify the cam shaft sprocket to be adjustable for the camshaft to be move a few degrees left or right. Think of it as a manual VVTI mod. I am planning to do this when it is time.

Advancing the cam shifts the torque/HP lower on the RPM band
Retarding the cam shifts the torque/HP higher on the RPM band

Any assistance on this will be greatly appreciated. Plus if it works, i will do a write up.

[fastone01]

No replies? Nobody here in this forum knows? Help a brother out!!!!!

[Dude Boy]

I wrote a technical paper when I was in college about 40 years ago, on the theory behind doing this. It's a trade off, and I wouldn't even attempt it on a modern DOHC engine like the Tundra. It's true you might find some power or torque at a given RPM, but you lose at other, possibly more important operating ranges. I've tried checking this on a Chevy V8 short block one time and I had a large diameter degree wheel, dial indicator, positive stop device for checking true TDC, and I still ran into trouble. I had all the camshaft specs as far as lift and duration, but I ran into trouble with not having the cam manufacturers specs for the clearance ramps. There was a spec that you were supposed to use for cam lobe lift to begin reading the degree wheel. I was lost without it. The method used for "indexing" the cam was to use an offset bushing for the cam sprocket. Other methods I've seen are offset keys, and alternate mounting holes to give advance or retard. Later they came out with a method of using the lobe centerlines that sort of standardized the procedure for dialing in a camshaft between manufacturers. You should be able to read up on this by consulting hop-up manuals for domestic engines, or to see how they recommend doing it for the import hot rods such as the Honda's. The main reason for doing this in the old days was to rule out factory inaccuracies and to arrive at a "blueprinted" engine that would run better than the average. As you probably know, indexing the cam is just a small part of blueprinting an engine. I could see where the mill would come in handy, but how about the Latte machine?

[fastone01]

[quote=Dude Boy]There was a spec that you were supposed to use for cam lobe lift to begin reading the degree wheel.

Dude Boy,

You hit it dead on. This is the spec I am looking for our trucks. Alot of members here are also talking about keeping there truck for a very long time. The I Force V8 is a fairly new motor. One more reason I want the FYI info on the cam shaft is if you rebuild the motor, shave the heads, then what? Without the spec, even using the timing marks, when putting it back, all 4 cams are 1 to 5 degrees retarded. Without the spec, you are lost.

In any event, the more info you know about the our truck, the better off we are fixing this on years to come.

The Idea of doing a manual cam timing adjustment is a experiment for me while I am doing the timing belt. Has any body done one on a quad cam setup? Hella tedious but no biggy.

I think it is worth looking into. Any mechanical device always has a so called within spec of Plus/minus whatever within spec.

All our engines when it come out of the factory are all within spec. But, making this tighter/looser spec here and there can make a big difference on how the motor produce hp/tq.

So, anybody here knows????

By the way, my neighbor, he has everything on his garage including a latte.
Check this engine out!

Ask me later what engine is this. You will be suprise!

[silverTRD]

i recognize that engine! thats the mini muscle! its a mini v8...those things are sweet!!! i cant believe how pricey though.

[v8Toilet]

[quote=fastone01]

Originally Posted by Dude Boy

There was a spec that you were supposed to use for cam lobe lift to begin reading the degree wheel.

Dude Boy,

You hit it dead on. This is the spec I am looking for our trucks. Alot of members here are also talking about keeping there truck for a very long time. The I Force V8 is a fairly new motor. One more reason I want the FYI info on the cam shaft is if you rebuild the motor, shave the heads, then what? Without the spec, even using the timing marks, when putting it back, all 4 cams are 1 to 5 degrees retarded. Without the spec, you are lost.

In any event, the more info you know about the our truck, the better off we are fixing this on years to come.

The Idea of doing a manual cam timing adjustment is a experiment for me while I am doing the timing belt. Has any body done one on a quad cam setup? Hella tedious but no biggy.

I think it is worth looking into. Any mechanical device always has a so called within spec of Plus/minus whatever within spec.

All our engines when it come out of the factory are all within spec. But, making this tighter/looser spec here and there can make a big difference on how the motor produce hp/tq.

So, anybody here knows????

By the way, my neighbor, he has everything on his garage including a latte.
Check this engine out!

Ask me later what engine is this. You will be suprise!

Is it possible to put a degree wheel on the engine with a dial indicator on the camshaft and find those specifications yourself? I did this with an OHC engine I rebuilt years ago to find out what the stock camshaft specifications where.

[fastone01]

What I am looking for is something like this. See Pic1. Which is this toyota 4 cylinder twin Cam japanese engine. See Pic2 and Pic3. Which went on a 72 Toyota Corolla I have.

A twin cam or a quad cam engine is a different animal than a single overhead cam engine. To anybody here who is a total gear head should know that the potential of playing with the cam shaft timing spec can unleash big gains in HP/Tq or vice versa if you do not have the spec which I am looking for.

If done correctly here are the gains

- More Torque/HP
- Increase gas mileage
- Less carbon build up
- More tuning for your mods especially with headers

Reverse effect if done incorrectly. I am willing to play and pay.

To all seeking about increasing gas mileage or complaining about not able to spin there tires or lack of torque. Help me out and find the V8 tundra cam spec.

I want my truck to have the potential of doing this. See pic4.

Now for my neighbor. This is his hobby. He builts this things from scratch. And it runs. As said before, he has the a whole machine shop in his garage and he owes me tons of favors. See Pic5.

[rando]

I've degreed cams on motorcycles to set lobe center after decking, with aftermarket cams.
I would get the crank angle for .010" lift on both sides of the cam lobe and subtract to find lobe center, before making any changes. This will give you the baseline setup. Then if you make changes to the cam timing, you will know how much you changed. If you find the specification you can work from that, but I would probably find lobe centers to see how my engine compares to the spec.